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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t8FQf-0000000BhyN-3XAf; Tue, 05 Nov 2024 09:00:50 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id E6CA330083E; Tue, 5 Nov 2024 10:00:48 +0100 (CET) Date: Tue, 5 Nov 2024 10:00:48 +0100 From: Peter Zijlstra To: Andrew Morton Cc: syzbot , linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Boqun Feng Subject: Re: [syzbot] [mm?] WARNING: locking bug in __set_page_owner Message-ID: <20241105090048.GZ9767@noisy.programming.kicks-ass.net> References: <6727a996.050a0220.35b515.019e.GAE@google.com> <20241104193345.94e0d057a6b16dfb9d83a3fc@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241104193345.94e0d057a6b16dfb9d83a3fc@linux-foundation.org> X-Rspamd-Queue-Id: 0218714002C X-Stat-Signature: ux1mjn6ie6na6i587hpjwmd7g47eqw8k X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1730797227-705196 X-HE-Meta: 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 m0YpiYez 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Nov 04, 2024 at 07:33:45PM -0800, Andrew Morton wrote: > On Sun, 03 Nov 2024 08:49:26 -0800 syzbot wrote: > > > Hello, > > > > syzbot found the following issue on: > > Help. I don't understand this lockdep report. > add_stack_record_to_list() is taking spin_lock_irqsave(stack_list_lock) > from within softirq. all seems well? spinlock_t from hardirq context, which is not fine. Should be raw_spinlock_t. Anyway, I send a proposal for this one yesterday, and so far nobody seems to have screamed murder, so I suppose I'll make it compiler and send out proper. https://lkml.kernel.org/r/20241104114506.GC24862@noisy.programming.kicks-ass.net